/*
 * Copyright The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hbase.util;

/**
 * Utilities for class manipulation.
 */
public class Classes {

	/**
	 * Equivalent of {@link Class#forName(String)} which also returns classes for
	 * primitives like <code>boolean</code>, etc.
	 * 
	 * @param className
	 *          The name of the class to retrieve. Can be either a normal class or
	 *          a primitive class.
	 * @return The class specified by <code>className</code>
	 * @throws ClassNotFoundException
	 *           If the requested class can not be found.
	 */
	public static Class<?> extendedForName(String className) throws ClassNotFoundException {
		Class<?> valueType;
		if (className.equals("boolean")) {
			valueType = boolean.class;
		} else if (className.equals("byte")) {
			valueType = byte.class;
		} else if (className.equals("short")) {
			valueType = short.class;
		} else if (className.equals("int")) {
			valueType = int.class;
		} else if (className.equals("long")) {
			valueType = long.class;
		} else if (className.equals("float")) {
			valueType = float.class;
		} else if (className.equals("double")) {
			valueType = double.class;
		} else if (className.equals("char")) {
			valueType = char.class;
		} else {
			valueType = Class.forName(className);
		}
		return valueType;
	}

	public static String stringify(Class<?>[] classes) {
		StringBuilder buf = new StringBuilder();
		if (classes != null) {
			for (Class<?> c : classes) {
				if (buf.length() > 0) {
					buf.append(",");
				}
				buf.append(c.getName());
			}
		} else {
			buf.append("NULL");
		}
		return buf.toString();
	}
}
